CVE-2021-32766— Nextcloud 安全漏洞
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I. CVE-2021-32766の基本情報
脆弱性情報
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脆弱性タイトル
Nextcloud Text app can disclose existence of folders in "File Drop" link share
ソース: NVD (National Vulnerability Database)
脆弱性説明
Nextcloud Text is an open source plaintext editing application which ships with the nextcloud server. In affected versions the Nextcloud Text application returned different error messages depending on whether a folder existed in a public link share. This is problematic in case the public link share has been created with "Upload Only" privileges. (aka "File Drop"). A link share recipient is not expected to see which folders or files exist in a "File Drop" share. Using this vulnerability an attacker is able to enumerate folders in such a share. Exploitation requires that the attacker has access to a valid affected "File Drop" link share. It is recommended that the Nextcloud Server is upgraded to 20.0.12, 21.0.4 or 22.0.1. Users who are unable to upgrade are advised to disable the Nextcloud Text application in the app settings.
ソース: NVD (National Vulnerability Database)
CVSS情報
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
ソース: NVD (National Vulnerability Database)
脆弱性タイプ
通过错误消息导致的信息暴露
ソース: NVD (National Vulnerability Database)
脆弱性タイトル
Nextcloud 安全漏洞
ソース: CNNVD (China National Vulnerability Database)
脆弱性説明
Nextcloud是德国Nextcloud公司的一套开源的自托管文件同步和共享的通信应用平台。 Nextcloud Text 存在安全漏洞，该漏洞源于在受影响的版本中，Nextcloud Text 应用程序返回不同的错误消息，具体取决于公共链接共享中是否存在文件夹。如果公共链接共享是使用“仅上传”权限创建的，则这是有问题的。 （又名“文件删除”）。链接共享收件人不会看到“文件放置”共享中存在哪些文件夹或文件。使用此漏洞，攻击者能够枚举此类共享中的文件夹。漏洞利用要求攻击者有权访问有效的受影响的“文件删除”
ソース: CNNVD (China National Vulnerability Database)
CVSS情報
N/A
ソース: CNNVD (China National Vulnerability Database)
脆弱性タイプ
N/A
ソース: CNNVD (China National Vulnerability Database)
影響を受ける製品
| ベンダー | プロダクト | 影響を受けるバージョン | CPE | 購読 |
|---|---|---|---|---|
| nextcloud | security-advisories | < 20.0.12 | - |
II. CVE-2021-32766の公開POC
| # | POC説明 | ソースリンク | Shenlongリンク |
|---|
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- https://github.com/nextcloud/text/pull/1716x_refsource_MISC
- https://hackerone.com/reports/1253475x_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2021-32766
Same Patch Batch · nextcloud · 2021-09-07 · 9 CVEs total
| CVE-2021-32802 | 9.3 CRITICAL | Preview generation used third-party library not suited for user-generated content in Nextc |
| CVE-2021-32800 | 8.1 HIGH | Bypass of Two Factor Authentication in Nextcloud server |
| CVE-2021-37628 | 7.5 HIGH | File Drop can be bypassed using Richdocuments app in nextcloud |
| CVE-2021-37630 | 6.5 MEDIUM | Secret Circle can be joined without approval in Nextcloud Circles |
| CVE-2021-37631 | 6.5 MEDIUM | Circle can be accessed by non-Circle members in Nextcloud Deck |
| CVE-2021-32782 | 5.8 MEDIUM | Cross-Site Scripting in Nextcloud Circles |
| CVE-2021-32801 | 5.5 MEDIUM | Exceptions may have logged Encryption-at-Rest key content in Nextcloud server |
| CVE-2021-37629 | 5.3 MEDIUM | Lack of ratelimit on Richdocuments OCS endpoint in nextcloud |
IV. 関連脆弱性
同じ製品: security-advisories
- CVE-2026-28272
Kiteworks Email Protection Gateway has a Cross-site Scriptin - CVE-2026-28271
Kiteworks Core is vulnerable to Server-Side Request Forgery - CVE-2026-28270
Kiteworks Core has an Unrestricted Upload of File with Dange - CVE-2026-28269
Kiteworks Core has an OS Command Injection - CVE-2025-66558
Nextcloud Twofactor WebAuthn app was updated based on public
同じベンダー: nextcloud
- CVE-2025-66558
Nextcloud Twofactor WebAuthn app was updated based on public - CVE-2025-66556
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Nextcloud Desktop discloses information when attempting to l - CVE-2025-66545
Nextcloud Groupfolders users with read-only permissions for
同じ弱点: CWE-209
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monetr is vulnerable to server-side request forgery in Lunch - CVE-2025-31960
HCL BigFix Service Management (SM) is vulnerable to informat - CVE-2025-59853
HCL DFXAnalytics is affected by an Improper Error Handling v - CVE-2026-40969
Spring gRPC AuthenticationException message reflected to rem - CVE-2026-3259
Sensitive Data Disclosure in BigQuery via Materialized View
V. CVE-2021-32766へのコメント
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